KR20130056819A - 멀티레벨 기입 전류를 이용한 자기 기록 시스템 - Google Patents

멀티레벨 기입 전류를 이용한 자기 기록 시스템 Download PDF

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Publication number
KR20130056819A
KR20130056819A KR1020120104914A KR20120104914A KR20130056819A KR 20130056819 A KR20130056819 A KR 20130056819A KR 1020120104914 A KR1020120104914 A KR 1020120104914A KR 20120104914 A KR20120104914 A KR 20120104914A KR 20130056819 A KR20130056819 A KR 20130056819A
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KR
South Korea
Prior art keywords
write
data
magnetic
multilevel
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
KR1020120104914A
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English (en)
Korean (ko)
Inventor
보리스 리브시츠
로스 에스 윌슨
제이슨 에스 골드버그
Original Assignee
엘에스아이 코포레이션
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 엘에스아이 코포레이션 filed Critical 엘에스아이 코포레이션
Publication of KR20130056819A publication Critical patent/KR20130056819A/ko
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10018—Improvement or modification of read or write signals analog processing for digital recording or reproduction
    • G11B20/10027—Improvement or modification of read or write signals analog processing for digital recording or reproduction adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10009—Improvement or modification of read or write signals
    • G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2508—Magnetic discs
    • G11B2220/2516—Hard disks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
KR1020120104914A 2011-11-22 2012-09-21 멀티레벨 기입 전류를 이용한 자기 기록 시스템 Withdrawn KR20130056819A (ko)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/302,169 US20130128375A1 (en) 2011-11-22 2011-11-22 Magnetic Recording System With Multi-Level Write Current
US13/302,169 2011-11-22

Publications (1)

Publication Number Publication Date
KR20130056819A true KR20130056819A (ko) 2013-05-30

Family

ID=46851843

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120104914A Withdrawn KR20130056819A (ko) 2011-11-22 2012-09-21 멀티레벨 기입 전류를 이용한 자기 기록 시스템

Country Status (6)

Country Link
US (1) US20130128375A1 (https=)
EP (1) EP2597641A1 (https=)
JP (1) JP2013109815A (https=)
KR (1) KR20130056819A (https=)
CN (1) CN103137142A (https=)
TW (1) TWI536374B (https=)

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JP5048860B1 (ja) * 2011-08-29 2012-10-17 株式会社日立製作所 磁気記録装置
US9030770B2 (en) * 2012-11-02 2015-05-12 HGST Netherlands B.V. Programmable analog feed-forward timer for dynamic wave shaping
US9105276B2 (en) * 2013-02-13 2015-08-11 Avago Technologies General Ip (Singapore) Pte. Ltd. System and method for providing controllable steady state current waveshaping in a hard disk drive (HDD) preamplifier
KR20150022241A (ko) * 2013-08-22 2015-03-04 에스케이하이닉스 주식회사 반도체 메모리 장치
US9013816B2 (en) 2013-08-27 2015-04-21 Lsi Corporation Adaptive pattern detection for pattern-dependent write current control in a magnetic recording system
US8792197B1 (en) 2013-09-20 2014-07-29 Lsi Corporation Storage device with driver controller providing pattern-dependent write functionality
US8929013B1 (en) * 2013-11-08 2015-01-06 Lsi Corporation Storage system with pattern dependent write
US9430148B2 (en) 2014-05-01 2016-08-30 Avago Technologies General Ip (Singapore) Pte. Ltd. Multiplexed synchronous serial port communication with skew control for storage device
US9281005B2 (en) 2014-05-01 2016-03-08 Avago Technologies General Ip (Singapore) Pte. Ltd. Multiplexed communication in a storage device
US9343103B2 (en) 2014-07-11 2016-05-17 Avago Technologies General Ip (Singapore) Pte. Ltd. Serial port communication for storage device using single bidirectional serial data line
US9111561B1 (en) * 2014-10-28 2015-08-18 HGST Netherlands B.V. Magnetic recording disk drive with write current overshoot amplitude (OSA) responsive to data transitions
US9183859B1 (en) * 2014-11-11 2015-11-10 Western Digital (Fremont), Llc HAMR writer pole length characterization
US9530447B2 (en) * 2015-02-27 2016-12-27 Seagate Technology Llc Adaptive HAMR power data storage device
US9601152B2 (en) * 2015-03-06 2017-03-21 Texas Instruments Incorporated Additional overshoot current HDD write driver circuit
US20160260454A1 (en) * 2015-03-06 2016-09-08 Texas Instruments Incorporated Configurable write current overshoot system for hdd write driver
US9275656B1 (en) 2015-07-20 2016-03-01 HGST Netherlands B.V. Disk drive with channel and preamp with dynamic write-current control for write head
US10164592B1 (en) * 2015-08-24 2018-12-25 Seagate Technology Llc Individually programmable preamplifier
US9368132B1 (en) 2015-09-04 2016-06-14 Western Digital Technologies, Inc. Data storage device employing differential write data signal and differential write pattern signal
US9754610B2 (en) * 2015-12-21 2017-09-05 Avago Technologies General Ip (Singapore) Pte. Ltd. Magnetic recording system with ternary pattern dependent write signaling
US9721588B2 (en) * 2015-12-28 2017-08-01 Avago Technologies General Ip (Singapore) Pte. Ltd. Magnetic recording system including differentiated write current emphasis signal generator circuit
US9715887B2 (en) * 2015-12-28 2017-07-25 Avago Technologies General Ip (Singapore) Pte. Ltd. Magnetic recording system using pattern dependent writer having register pages for storing write currents
US9536604B1 (en) 2016-01-06 2017-01-03 International Business Machines Corporation Impedance matching system for DDR memory
JP2018049677A (ja) 2016-09-23 2018-03-29 株式会社東芝 磁気ディスク装置、調整方法、及び製造方法
US9824699B1 (en) * 2017-01-31 2017-11-21 Seagate Technology Llc Lumped-parameter thermal model of a write transducer for clearance control on magnetic recording device
JP2018147526A (ja) * 2017-03-01 2018-09-20 株式会社東芝 磁気ディスク装置
JP2019016418A (ja) 2017-07-10 2019-01-31 株式会社東芝 磁気記録再生装置
JP2019046523A (ja) * 2017-09-04 2019-03-22 株式会社東芝 磁気ディスク装置及びライト処理方法
US10991391B1 (en) * 2020-02-04 2021-04-27 Headway Technologies, Inc. Circuits and methods for modifying the write current waveform to improve track density in HDD
US11495249B1 (en) * 2021-04-12 2022-11-08 Seagate Technology Llc Method and apparatus for magnetically recording data with three or more states per unit of data
US11894025B1 (en) 2022-03-09 2024-02-06 Marvell Asia Pte Ltd Disk writing mode providing main pole relaxation
US11915729B1 (en) 2022-03-09 2024-02-27 Marvell Asia Pte Ltd Disk writing mode with timing control of main pole relaxation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482927A (en) * 1982-01-15 1984-11-13 Sperry Corporation Ternary magnetic recording and reproducing system with simultaneous overwrite
WO1995035565A1 (en) * 1994-06-17 1995-12-28 Minnesota Mining And Manufacturing Company Nrz magnetic recording
DE10195964T1 (de) * 2000-03-31 2003-06-18 Seagate Technology Llc Pulsschreibstrom ausgestaltet für einen Feldaufrechterhaltungsstrom in einer Datenspeichervorrichtung
US6826003B1 (en) * 2002-01-31 2004-11-30 Western Digital Technologies, Inc. Disk drive comprising a pattern dependent overshoot circuit for controlling write current overshoot
KR100468778B1 (ko) * 2002-12-13 2005-01-29 삼성전자주식회사 하드디스크 드라이브의 기록 전류 최적화 방법 및 기록밀도 설정 방법
US7372649B2 (en) * 2003-04-03 2008-05-13 Texas Instruments Incorporated Apparatus and method for applying write signals for driving a write head
KR100532486B1 (ko) * 2003-12-24 2005-12-02 삼성전자주식회사 하드디스크 드라이브의 기록 전류 제어 방법
US7944641B2 (en) * 2008-01-28 2011-05-17 Samsung Electronics Co., Ltd. Overshoot duration range selection in a hard disk drive

Also Published As

Publication number Publication date
US20130128375A1 (en) 2013-05-23
TWI536374B (zh) 2016-06-01
EP2597641A1 (en) 2013-05-29
TW201333944A (zh) 2013-08-16
CN103137142A (zh) 2013-06-05
JP2013109815A (ja) 2013-06-06

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Legal Events

Date Code Title Description
PA0109 Patent application

Patent event code: PA01091R01D

Comment text: Patent Application

Patent event date: 20120921

PG1501 Laying open of application
N231 Notification of change of applicant
PN2301 Change of applicant

Patent event date: 20150427

Comment text: Notification of Change of Applicant

Patent event code: PN23011R01D

PC1203 Withdrawal of no request for examination
WITN Application deemed withdrawn, e.g. because no request for examination was filed or no examination fee was paid